Records why main is protected with CI status checks only — no required approvals,
no required code-owner review. Public exclusion comes from repo WRITE ACCESS, not
a review rule; a self-approval requirement on a single-identity repo only creates
an unsatisfiable deadlock that forces --admin on every merge (cf #772).
- ADR-0221: context (the deadlock), the misconception corrected, the decision,
an explicit 'do not re-add human-review gates' guard for future agents, the
applied gh-api change, and the break-glass log.
- CODEOWNERS: comment corrected to ADVISORY-ONLY (require_code_owner_reviews is
now false); keeps * @AssetOverflow for ownership/auto-request, not gating.
Applied 2026-06-15: required_approving_review_count 1->0, require_code_owner_reviews
true->false; required status checks unchanged. This PR is the first through the
fixed normal path — its clean, approval-free, no-admin merge is the proof.
